Remove unused 'printCost' field from ExplainState, and simplify the code

accordingly (this field was always initialized to true). Patch from
Alvaro Herrera.

diff --git a/src/backend/commands/explain.c b/src/backend/commands/explain.c
index 30c4cca7316dd7ca438be61418fcfd471d24fe1e..cd69a2782ec7d874e361b5515a52c1e30d1d4eb5 100644 (file)
--- a/src/backend/commands/explain.c
+++ b/src/backend/commands/explain.c
@@ -38,7 +38,6 @@
 typedef struct ExplainState
 {
        /* options */
-       bool            printCost;              /* print cost */
        bool            printNodes;             /* do nodeToString() too */
        bool            printAnalyze;   /* print actual times */
        /* other states */
@@ -246,7 +245,6 @@ ExplainOnePlan(QueryDesc *queryDesc, ExplainStmt *stmt,
 
        es = (ExplainState *) palloc0(sizeof(ExplainState));
 
-       es->printCost = true;           /* default */
        es->printNodes = stmt->verbose;
        es->printAnalyze = stmt->analyze;
        es->rtable = queryDesc->parsetree->rtable;
@@ -266,18 +264,14 @@ ExplainOnePlan(QueryDesc *queryDesc, ExplainStmt *stmt,
                        pfree(s);
                        do_text_output_multiline(tstate, f);
                        pfree(f);
-                       if (es->printCost)
-                               do_text_output_oneline(tstate, "");             /* separator line */
+                       do_text_output_oneline(tstate, "");             /* separator line */
                }
        }
 
        str = makeStringInfo();
 
-       if (es->printCost)
-       {
-               explain_outNode(str, queryDesc->plantree, queryDesc->planstate,
-                                               NULL, 0, es);
-       }
+       explain_outNode(str, queryDesc->plantree, queryDesc->planstate,
+                                       NULL, 0, es);
 
        /*
         * If we ran the command, run any AFTER triggers it queued.  (Note this
@@ -358,13 +352,10 @@ ExplainOnePlan(QueryDesc *queryDesc, ExplainStmt *stmt,
 
        totaltime += elapsed_time(&starttime);
 
-       if (es->printCost)
-       {
-               if (stmt->analyze)
-                       appendStringInfo(str, "Total runtime: %.3f ms\n",
-                                                        1000.0 * totaltime);
-               do_text_output_multiline(tstate, str->data);
-       }
+       if (stmt->analyze)
+               appendStringInfo(str, "Total runtime: %.3f ms\n",
+                                                1000.0 * totaltime);
+       do_text_output_multiline(tstate, str->data);
 
        pfree(str->data);
        pfree(str);
@@ -667,32 +658,30 @@ explain_outNode(StringInfo str,
                default:
                        break;
        }
-       if (es->printCost)
-       {
-               appendStringInfo(str, "  (cost=%.2f..%.2f rows=%.0f width=%d)",
-                                                plan->startup_cost, plan->total_cost,
-                                                plan->plan_rows, plan->plan_width);
+       
+       appendStringInfo(str, "  (cost=%.2f..%.2f rows=%.0f width=%d)",
+                                        plan->startup_cost, plan->total_cost,
+                                        plan->plan_rows, plan->plan_width);
 
-               /*
-                * We have to forcibly clean up the instrumentation state because
-                * we haven't done ExecutorEnd yet.  This is pretty grotty ...
-                */
-               if (planstate->instrument)
-                       InstrEndLoop(planstate->instrument);
+       /*
+        * We have to forcibly clean up the instrumentation state because
+        * we haven't done ExecutorEnd yet.  This is pretty grotty ...
+        */
+       if (planstate->instrument)
+               InstrEndLoop(planstate->instrument);
 
-               if (planstate->instrument && planstate->instrument->nloops > 0)
-               {
-                       double          nloops = planstate->instrument->nloops;
+       if (planstate->instrument && planstate->instrument->nloops > 0)
+       {
+               double          nloops = planstate->instrument->nloops;
 
-                       appendStringInfo(str, " (actual time=%.3f..%.3f rows=%.0f loops=%.0f)",
-                                               1000.0 * planstate->instrument->startup / nloops,
-                                                 1000.0 * planstate->instrument->total / nloops,
-                                                        planstate->instrument->ntuples / nloops,
-                                                        planstate->instrument->nloops);
-               }
-               else if (es->printAnalyze)
-                       appendStringInfo(str, " (never executed)");
+               appendStringInfo(str, " (actual time=%.3f..%.3f rows=%.0f loops=%.0f)",
+                                       1000.0 * planstate->instrument->startup / nloops,
+                                         1000.0 * planstate->instrument->total / nloops,
+                                                planstate->instrument->ntuples / nloops,
+                                                planstate->instrument->nloops);
        }
+       else if (es->printAnalyze)
+               appendStringInfo(str, " (never executed)");
        appendStringInfoChar(str, '\n');
 
        /* quals, sort keys, etc */